Posted By: Von
Horsepower TV Boo Boo - 03/05/11 05:58 PM
Watching HP TV build a "alcohol" 383 SBC. How do they figure they have a 12.5 to 1 motor with a flat top piston and 64 cc heads????
The best I can come up with is 11.25?
Posted By: HEMIFRED
Re: Horsepower TV Boo Boo - 03/05/11 06:10 PM
if compression test is around 200 that could work
Posted By: Von
Re: Horsepower TV Boo Boo - 03/05/11 06:12 PM
They claimed they have a 12.5 to 1 motor...by the calculators, no way they are close.
With the cam they "said" they are using, basically a pump gas motor
The dude stated something to the lines of "You get all of this compression (12.5) by using a flat top piston? Huh.....So I was waiting for a mid 50ish cc head, nope. He then stated a 64 cc chamber.
Posted By: Bob_Coomer
Re: Horsepower TV Boo Boo - 03/05/11 09:10 PM
saw that, yea no way a flat top small chevy is 12.5:1 compression unless the head has chambers super small
Posted By: Dartcuda
Re: Horsepower TV Boo Boo - 03/05/11 09:19 PM
Didn't he say they were using a .015" head gasket ?
Posted By: 440Jim
Re: Horsepower TV Boo Boo - 03/06/11 12:04 AM
I agree running a zero deck piston with 0.015" head gasket and closed chamber heads is tight. But with these assumptions, I get 12.2 CR
3.75 stroke, 4.030" bore, 383 CID
zero deck
0.015" head gasket (3cc at 4" bore)
3 cc valve reliefs (small)
64 cc head
But if the piston is 0.010" down the hole, it is only 11.9
Posted By: cjfordman
Re: Horsepower TV Boo Boo - 03/06/11 05:32 AM
From what I've heard its a wonder Joe didn't drink most of the alcohol before the dyno runs
Posted By: 67_Satellite
Re: Horsepower TV Boo Boo - 03/06/11 02:15 PM
The power always comes from the magic "extra 2 degrees of timing"they add for the final pull.
